JPH0416723Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an attachment structure for attaching a tow hook for a vehicle to a vehicle frame.

[Prior Art] A mounting structure for mounting a conventional towing hook for a vehicle on a vehicle frame is shown in FIGS. 4 and 5. The towing hook 1 is fixed to the base plate 2 by means such as welding. The base plate 2 is firmly attached to the vehicle frame 3 with bolts 4. Incidentally, a mounting structure for the tow hook is also proposed in Japanese Patent Application Laid-open No. 8163/1983.

In the conventional mounting structure described above, the vehicle frame 3 to which the base plate 2 is attached is in the same state as being reinforced by the base plate 2, and exhibits greater rigidity than other parts of the vehicle frame. I will do it. Therefore, when an impact force F is applied from the direction of the arrow in the figure, the vehicle frame 3 undergoes unnatural deformation as shown in FIG. 6. That is, the portion of the vehicle frame 3 to which the base plate 2 is attached cannot deform naturally, and the performance of the vehicle frame 3 to absorb impact energy is therefore reduced.

[Problems to be solved by the invention] The present invention was developed in view of the above-mentioned problems, and when an impact is applied, it causes natural deformation similar to the part to which the tow hook is not attached. An object of the present invention is to provide a mounting structure for a vehicle tow hook that can appropriately absorb energy.

[Means and effects for solving the problems] The present invention is such that the towing hook falls off together with the base plate when an impact force is applied to the vehicle frame. This falling-off can be prevented by communicating the bolt insertion hole with the open part so that the bolt head can fall out of the open part in the event of an impact.
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That is, in the mounting structure of the vehicle towing hook of the present invention, the towing hook is fixed to a base plate, and this base plate is attached to the vehicle frame, and the bolts are bolts formed on the base plate. It is inserted through the insertion hole.

Therefore, when an impact is applied to the towing hook from the hook end side, the bolt head is moved from the bolt insertion hole to the opening provided at the hook end side of the towing hook with respect to the base plate. , it comes off the open part. At this time, the bolt head comes into contact with the inclined portion of the guide piece that projects rearward and downward at the hook end side of the towing hook in the open part, and is not caught on the edge of the open part. This allows the base plate and tow hook to fall off smoothly.

[Example] An example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing a state in which the towing hook 1 is fixed to the base plate 2. As shown in FIG. The bolts 4 used for installation are inserted into the bolt insertion holes 11 from the bottom to the top of the base plate 2.
is inserted into the The bolt insertion holes 11 are formed at two locations in total, one on the front side and the other on the rear side of the vehicle (the direction of arrow A in FIG. 1 indicates the front of the vehicle). The front edge of the base plate 2 is cut into a substantially triangular shape to form an open portion 12. This open portion 12 communicates with the bolt insertion hole 11 on the front side. Further, another open portion 13 having a substantially triangular shape at the rear is formed in the center of the base plate 2. This open portion 13 and the bolt insertion hole 11 on the rear side communicate with each other. A guide piece 14 is provided in a protruding manner within this open portion 13 . The guide piece 14 is integrally formed on the front edge of the open portion 13, and protrudes at an angle toward the rear and lower side. This inclined portion is formed sufficiently long, and the tip 14A of the inclined portion is located below the height position of the head 15 of the bolt 4 on the rear side.

Next, the operation of this embodiment will be explained.

When an impact force is applied to the vehicle frame 3, the base plate 2 and the towing hook 1 fall smoothly in the following manner. That is, the first
Impact force F from the direction of arrow B in the figure (shown in Figure 1)
When a force is applied to the hook end (tip) of the towing hook 1, the towing hook 1 exerts a force against the vehicle frame 3 toward the rear of the vehicle. When this backward force is applied, the two bolts 4, 4 are attached to the base plate 2.
The driver tries to move toward the front of the vehicle. At this time, the bolt insertion hole 1 into which the bolt 4 is inserted
Since bolts 1 and 11 communicate with openings 12 and 13, respectively, bolts 4 and 4 communicate with openings 12 and 13, respectively.
It moves to 2,13. The cross-sectional area of the open parts 12 and 13 is made sufficiently larger than the area of the bolt head 15, so that the bolt head 15 is removed from the base plate 2. After coming off, the bolts 4, 4 further move toward the front of the vehicle. At this time, the bolt head 15 on the rear side contacts the inclined portion of the guide piece 14 and is not caught on the end surface of the opening portion 13 on the vehicle front side. This contact causes the base plate 2 to
The towing hook 1 is then knocked down downward, resulting in a smooth fall. As a result, the vehicle frame 3 naturally deforms as shown in FIG. 3 due to the impact force, so that the impact energy absorption performance of the vehicle frame 3 is improved. Note that during normal towing, the bolts 4, 4 are received at the bolt insertion holes 11 and the rear side of the insertion holes 11, so that towing is performed without any problem.

[Effect of the invention] According to the mounting structure of the vehicle towing hook of the present invention, when an impact force is applied to the vehicle frame, the head of the bolt used for mounting comes off from the open part, so that the base plate and the towing hook are After falling off, the vehicle frame undergoes natural deformation due to the impact force, thereby improving the impact energy absorption performance of the vehicle frame.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the base plate to which the towing hook used in the vehicle towing hook mounting structure of the present invention is fixed, Fig. 2 is a side view of Fig. 1, and Fig. 3 shows the towing hook falling off. Figure 4 is a vertical cross-sectional side view showing the mounting structure of a conventional vehicle towing hook, Figure 5 is a plan view of Figure 4 with the vehicle frame removed, and Figure 6 is the conventional vehicle frame. FIG. 3 is a diagram showing the vehicle frame when an impact force is applied to the mounting structure of the vehicle. 1... Towing hook, 2... Base plate, 3... Vehicle frame, 4... Bolt, 11...
...Bolt insertion hole, 12, 13...Open part, 14...
...Guide piece, 15...Bolt head.

Claims (1)

[Scope of utility model registration request] a base plate to which a tow hook is fixed;
A bolt for attaching the base plate to the vehicle frame, a bolt insertion hole formed in the base plate for inserting the bolt, and a bolt insertion hole provided on the hook end side of the towing hook of the bolt insertion hole and communicating with the bolt insertion hole. A towing hook for a vehicle, characterized in that the opening portion is larger than the diameter of the bolt head, and a guide piece projects from the hook end of the towing hook in the opening portion so as to be inclined rearward and downward. mounting structure.